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This is a push or pull exerted by a magnet. The force of attraction between an object and a magnet is called magnetism. All magnets have north and south poles. This force is the attraction or repulsion that arises between electrically charged particles due to their motion. Example- Iron nails when placed near a magnet.

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This is the force by which the Earth or moon or other massively huge objects attract another object towards them. All objects on the Earth experience the gravitational force, which is directed downwards towards the center of the earth. The force of gravity is always equal to the weight of the object.

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It is a force that exists between all charged particles. It is all around us. It is responsible for making our hair stand on a cold day. When the hair on the head stands and refuses to be brushed, that is static energy. It is this force which allows you to see when you turn on the lamp in a dark room.

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A force with which an object has been pushed or pulled. Here a force is applied to an object by a person or any other object. Example- A person pushing a table to the other side of the room

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This a frictional force applied on objects when they are in air. Often the Air Resistance force opposes the movement of the object. It is noticeable for objects that travel at high speed up in the air. Example- An airplane or a parachute.

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A force caused by pressing down on an object. It is the force which results when a spring is stretched or compressed. A spring is a metal elastic device that returns to its original form when pulled or pressed. If the spring is stretched, spring force is attractive. If it is compressed, spring force is repulsive. Example- Trampoline, diving board etc.

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A force that is carried through a string, rope, cable or wire when it is pulled tightly by the object on the opposite end is a tension force. This force flows across the length of the wire or rope. Example- A cable car or climbing a mountain using a rope.

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A force caused by an object moving across a surface. It opposes the movement of the object.
Friction depends upon the nature of the two interacting surfaces. Example: A book sliding on the table, a ball rolling on the floor.

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1.  CONTACT FORCE
2. FIELD FORCES
3. APPLIED FORCE
4. FRICTIONAL FORCE
5 TENSION FORCE
6. SPRING FORCE (COMPRESSION)
7.  AIR RESISTANCE FORCE
8. ELECTRICAL FORCE
9. GRAVITATIONAL FORCE
10. MAGNETIC FORCE

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These types of forces happen when two interactive objects are not in physical contact with each other; yet they are able to push or pull. Types of Action at a distance forces are: Gravitational force, Electrical force and Magnetic forces.

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These are those types of forces when two objects interact with each other; they have a physical contact with each other. Types of contact forces are: Frictional force; Tension force; Normal Force; Air Resistance Force, Applied Force, Spring Force.

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                               GRADE 9 NATURAL SCIENCES

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                               GRADE 9 NATURAL SCIENCES

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TEACHING STRATEGY: DEFINITION AND GLOSSING

FORCES
Dictionary definition: Force is strength or energy applied towards any object for physical action or any movement.
Learner definition: A push, pull or twist applied on an object.